Model Layouts

I'm considering building one of the layouts contained in the Atlas Introduction to N Scale Model Railroading. In fact, it's the last one in the book. This plan has a maximum of 11' curves and a minimum of 9 3/4. I've been told that running anything like a 2-8-2 would look too "toy like". My questions, then, are these:

How would a 2-8-0 and 4-6-0 look here?
Did Southern run on double main lines around 1905 - 1910? Were there any double mains during this time? (My ignorance in railroading is now showing).

This is my first layout and I'd sure like to be able to run two trains if possible, but in the most realistic setting as possible.

Answers

The Southern Railway had double tracks on its main line between
Washington and Atlanta at an early age. I believe that much of the
Cincinnati to Chattanooga line was also double track in the early
years. A 2-8-0, 4-6-0, 4-4-2 or perhaps a small 4-6-2 would be
appropriate power for the 1905-1910 period.

Even where a railroad used a single track main, there would be
double track passing sidings that are long compared to the size of a
typical model railroad... so go ahead and use double track.

I've seen a somewhat limited selection of locomotives and rolling
stock for 1905-1910 in N scale. If this proves to be a problem, one
option would be to use four axle diesels. F units and GP units will
handle these radii with ease. Stick to 40' freight cars and you
should have no trouble. This would be very appropriate for the late
1940s and early 1950s.